Water resistant unsaturated polyester resin compositions
CA 2306243 A1 · Owner: Cook Composites And Polymers Company · Inventors: Zhao, Ming-Yang; Hsu, Chih-Pin; Bergstrom, Linda
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A curable thermoset resin composition useful for imparting water and/or solvent resistance to gel coated fiber-reinforced polymers comprising: (A) at least 5 wt.% of an at least partially end-capped unsaturated polyetherester resin; (B) an unsaturated polyester resin preferably modified with dicyclopentadiene having a ratio of the number average molecular weight to the average number of double bonds per polymer molecule in the range from about 200 to about 400, in an amount such that the weight ratio of polyester resin (B) to polyetherester resin (A) is in the range from about 10:90 to about 90:10; (C) about 10 to about 70 wt.% of at least one vinyl monomer; and (D) a curing agent. …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 9, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.